package day4;

public
class Student1 {
    public static
    void main(String[] args) {

    }
    private void study(){
        System.out.println("开始学习");
    }
    public int math(Integer n,Integer m){
        System.out.println("加法运算：");
        return n+m;
    }
}
class Teacher{
    public void teach(){
        System.out.println("开始教学");
    }
    public int age(Integer age){
        System.out.println("年龄：");
        return age;
    }

}